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Case Tractors Discussion Forum

Case 641c remote cylinder power

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Author  [Modern View]

02-11-2018 18:28:39

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I’m working on the hitch on my 641c I recently acquired. It’s using the remote cylinder setup to run an external hydraulic cylinder for lifting and dropping the 3 point. It has a bypass off of the hydraulic solenoid and I don’t know what it goes to. I do know with the valve closed I get power up and down. But with it open on the down stroke it just gravity’s down.
Anyone able to help me I’d what this is all about? third party image

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02-13-2018 18:27:44

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 Re: Case 641c remote cylinder power in reply to Pistonfarmer, 02-11-2018 18:28:39  
That tractor has only one stack valve and you indicated you are using an external cylinder for hitch lift, (a aftermarket or homemade hitch)????? With a cylinder hooked up to the quick couplers the the hitch will lift off one quick coupler line, with the valve in the line open the flow from the other line is sent straight to sump thereby not pressurizing the other quick coupler line in the opposite spool direction, thus relieving pump pressure on hitch lowering. With the little line valve closed the tractor coupler hydraulics would work normally. Anyone else have other thoughts??

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02-12-2018 08:04:16

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 Re: Case 641c remote cylinder power in reply to Pistonfarmer, 02-11-2018 18:28:39  
Quoting Removed, click Modern View to see

I think your right. That would make a lot of sense. For my needs right now I will lose it for two way action. Instead of single acting

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Jeremy McNary

02-11-2018 21:24:58

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 Re: Case 641c remote cylinder power in reply to Pistonfarmer, 02-11-2018 18:28:39  
my guess would be its for the return line of something that requires continuous hydraulic flow like a hydraulic motor etc so that the return oil didn't have to go through the valve which causes alot of heat and is hard on the pump and the oil. If that brass valve is open oil will dump directly back to the sump, close it and the valve will operate as normal for two direction cylinders.

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02-11-2018 18:29:23

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 Re: Case 641c remote cylinder power in reply to Pistonfarmer, 02-11-2018 18:28:39  
third party image

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Adirondack case guy

02-12-2018 15:05:59

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 Re: Case 641c remote cylinder power in reply to Pistonfarmer, 02-11-2018 18:29:23  
Interesting place to drill a return into the tranny. Defiantly not a factory option. I have to agree, that with the brass valve it was a return for single acting cylinder or a hyd. motor. I did the same thing on one of my 440s, but Used the hydraulic fill plug with a Tee for the return line from a shut off valve.

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